- \ulap and /dlap are up and down laps, in the same series as the originals;
- \xlap and \ylap are laps in the horizontal and vertical directions, respectively, and
- \zlap provides a box of zero dimensions in both axes, centred on its midpoint.
The author is unknown.
License: noinfo Version dated: 1993-02-15 Catalogued: 2016-06-24